/* 全局样式 */
body {
  margin: 0;
  padding: 0;
  font-family: 'Arial', sans-serif;
  background-color: #f4f4f4;
}

h1, h2, h3 {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

a {
  text-decoration: none;
}

ul {
  padding-left: 0;
}
